Sunday, November 1, 2009

C2447: missing function header (old-style formal list?) blog

The following error messages may appear if you try to use the function-try-block syntax.
error C2143: syntax error : missing ';' before 'try'
error C2143: syntax error : missing ';' before 'try'
error C2065: 'ii' : undeclared identifier
error C2143: syntax error : missing ';' before 'try'
error C2448: 'Unknown' : function-style initializer appears to be a function definition
error C2143: syntax error : missing ';' before 'catch'
error C2143: syntax error : missing ';' before '{'
error C2447: missing function header (old-style formal list?)

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CAUSEThe compiler does not support the function-try-block syntax as specified in the...The compiler does not support the function-try-block syntax as specified in the C++ Standard (section 15) quoted below:

-3- A function-try-block associates a handler-seq with the ctor-initializer, if present, and the function-body. An exception thrown during the execution of the initializer expressions in the ctor-initializer or during the execution of the function-body transfers control to a handler in a function-try-block in the same way as an exception thrown during the execution of a try-block transfers control to other handler.
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STATUSMicrosoft has confirmed that this is a bug in the Microsoft products that are li...Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.
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MORE INFORMATIONSteps to Reproduce BehaviorThe following code example demonstrates the error: //...Steps to Reproduce Behavior
The following code example demonstrates the error:
//test.cpp
// compiler option needed: /GX
int f(int);
class C {
int i;
public:
C(int);
};

C::C(int ii)
try
: i(f(ii))
{
// constructor function body
}
catch (...)
{
// handles exceptions thrown from the ctor-initializer
// and from the constructor function body
}

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